<?phpdefined('JPATH_BASE') or die;jimport('joomla.form.formfield');class JFormFieldAsset extends JFormField {            protected $type = 'Asset';        protected function getInput() {                $doc = JFactory::getDocument();                                $doc->addStyleSheet(JURI::root().'media/mod_celtawebtraffic/css/cw_config.css');                        return null;        }}?>